Element enrichment and provenance of the detrital component in Holocene sediments from the western Black Sea

•Oxic to euxinic transition of the Black Sea resulted in elemental enrichment or depletion of the sediments.•Diagenetic reactions, basin reservoir effect, adsorption and co-precipitation are the major controls on element enrichment.•Sr-Nd-Pb isotope composition of the terrigenous component is mainly controlled by the riverine suspended matter.